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These are all the tasks required to save, load, and cleanup
thumbnails.

base change: https://chromium-review.googlesource.com/c/chromium/src/+/984952

Bug: 794828
Change-Id: I1ce081f53913a9b4c24b7f00a9d173c3fc061696
Reviewed-on: https://chromium-review.googlesource.com/985014
Commit-Queue: Dan H <harringtond@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547444}